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type: table cell
Constructible from `h` and `v`. The lifetime of `h` and `v` are guaranteed to end no earlier than after the `W` is destroyed. The writer shall not access the contents of `h` or `v` before the first call to `init`, permitting lazy construction of the message.

The constructor may optionally require that `h` and `v` are `const` references, with these consequences:

* If `W` requires that `h` and `v` are const references, then the corresponding serializer constructors for messages with this body type will will accept a const reference to a message, otherwise:

* If `W` requires that `h` and `v` are non-const references, then the corresponding serializer constructors for messages with this body type will require a non-const reference to a message.
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English Chinese (Simplified Han script) Actions
* A body that does not entirely fit in memory.
* A body produced incrementally from coroutine output.
* A body represented by zero or more buffers already in memory.
* A body whose size is not known ahead of time.
* Body data generated dynamically from other threads.
* Body data computed algorithmically.
* 无法完整存入内存的消息体。
* 由协程输出逐步生成的消息体。
* 由已在内存中的零个或多个缓冲区表示的消息体。
* 大小无法预先确定的消息体。
* 由其他线程动态生成的消息体数据。
* 通过算法计算得到的消息体数据。
Associated Types
关联类型
* [link beast.ref.boost__beast__http__is_body_writer `is_body_writer`]
* __Body__
* [link beast.ref.boost__beast__http__is_body_writer `is_body_writer`]
* __Body__
Requirements
要求
These requirements may undergo non-backward compatible
这些要求可能发生不向后兼容的变更
In this table:
在下表中：
* `W` denotes a type meeting the requirements of [*BodyWriter].
* `B` denotes a __Body__ where
W 表示满足 [*BodyWriter] 要求的类型。

B 表示一个 Body 类型，其中
* `a` denotes a value of type `W`.
* `h` denotes a const value of type `header<isRequest, Fields> const&`.
* `v` denotes a possibly const value of type `Body::value_type&`.
* `ec` is a value of type [link beast.ref.boost__beast__error_code `error_code&`].
* `W<T>` is the type `boost::optional<std::pair<T, bool>>`.
* `a` 表示类型为 `W` 的值。
* `h` 表示类型为 `header<isRequest, Fields> const&` 的常量值。
* `v` 表示类型可能为常量的 `Body::value_type&` 值。
* `ec` 表示类型为 [link beast.ref.boost__beast__error_code `error_code&`] 的值。
* `W<T>` 表示类型 `boost::optional<std::pair<T, bool>>`。
Valid expressions
有效表达式
Expression
表达式
Type
类型
Semantics, Pre/Post-conditions
语义、前置条件与后置条件
`W::const_buffers_type`
`W::const_buffers_type`
A type which meets the requirements of __ConstBufferSequence__. This is the type of buffer returned by `W::get`.
该类型满足 ConstBufferSequence 的要求，为 W::get 返回的缓冲区类型。
`W{h,v};`
`W{h,v};`
Constructible from `h` and `v`. The lifetime of `h` and `v` are guaranteed to end no earlier than after the `W` is destroyed. The writer shall not access the contents of `h` or `v` before the first call to `init`, permitting lazy construction of the message.

The constructor may optionally require that `h` and `v` are `const` references, with these consequences:

* If `W` requires that `h` and `v` are const references, then the corresponding serializer constructors for messages with this body type will will accept a const reference to a message, otherwise:

* If `W` requires that `h` and `v` are non-const references, then the corresponding serializer constructors for messages with this body type will require a non-const reference to a message.
可从 `h` 和 `v` 构造。`h` 和 `v` 的生命周期保证不早于 `W` 销毁前结束。写入器在首次调用 `init` 之前不应访问 `h` 或 `v` 的内容，以支持消息的延迟构造。

构造函数可选择要求 `h` 和 `v` 为 const 引用，其影响如下：

* 若 `W` 要求 `h` 和 `v` 为 const 引用，则对应消息体类型的序列化器构造函数将接受对消息的 const 引用。
* 否则，若 `W` 要求 `h` 和 `v` 为非 const 引用，则对应消息体类型的序列化器构造函数将要求对消息的非 const 引用。
`a.init(ec)`
`a.init(ec)`
Called once to fully initialize the object before any calls to `get`. The message body becomes valid before entering this function, and remains valid until the writer is destroyed. The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if there was one.
最终译文：在调用 get 之前调用一次，以完全初始化对象。消息体在进入该函数前有效，并持续有效直到写入器销毁。该函数在无错误时确保 !ec 为 true，否则将 ec 设置为对应的错误码。
`a.get(ec)`
`a.get(ec)`
`W<W::const_buffers_type>`
`W<W::const_buffers_type>`
Called one or more times after `init` succeeds. This function returns `boost::none` if all buffers representing the body have been returned in previous calls or if it sets `ec` to indicate an error. Otherwise, if there are buffers remaining the function should return a pair with the first element containing a non-zero length buffer sequence representing the next set of octets in the body, while the second element is a `bool` meaning `true` if there may be additional buffers returned on a subsequent call, or `false` if the buffer returned on this call is the last buffer representing the body. The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if there was one.
`init` 成功后，该函数被调用一次或多次。若之前调用已返回代表该主体的所有缓冲区，或该函数设置 `ec` 用于指示错误，则该函数返回 `boost::none`。若仍存在剩余缓冲区，则该函数应返回一个 pair，其第一元素包含一个长度非零的缓冲区序列，用于表示该主体中下一组八位字节；其第二元素为 `bool` 类型，`true` 用于表示后续调用可能返回更多缓冲区，`false` 用于表示本次调用所返回的缓冲区为该主体最后一部分。该函数确保：若无错误，则 `!ec` 为 `true`；若存在错误，则将 `ec` 设为对应的错误码。
Exemplar
示例
Models
模型
* [link beast.ref.boost__beast__http__basic_dynamic_body.writer `basic_dynamic_body::writer`]
* [link beast.ref.boost__beast__http__basic_file_body__writer `basic_file_body::writer`]
* [link beast.ref.boost__beast__http__basic_string_body.writer `basic_string_body::writer`]
* [link beast.ref.boost__beast__http__buffer_body.writer `buffer_body::writer`]
* [link beast.ref.boost__beast__http__empty_body.writer `empty_body::writer`]
* [link beast.ref.boost__beast__http__span_body.writer `span_body::writer`]
* [link beast.ref.boost__beast__http__vector_body.writer `vector_body::writer`]
* [link beast.ref.boost__beast__http__basic_dynamic_body.writer `basic_dynamic_body::writer`]
* [link beast.ref.boost__beast__http__basic_file_body__writer `basic_file_body::writer`]
* [link beast.ref.boost__beast__http__basic_string_body.writer `basic_string_body::writer`]
* [link beast.ref.boost__beast__http__buffer_body.writer `buffer_body::writer`]
* [link beast.ref.boost__beast__http__empty_body.writer `empty_body::writer`]
* [link beast.ref.boost__beast__http__span_body.writer `span_body::writer`]
* [link beast.ref.boost__beast__http__vector_body.writer `vector_body::writer`]
English Chinese (Simplified Han script) Actions
Associated Types
关联类型
* [link beast.ref.boost__beast__http__is_body_writer `is_body_writer`]
* __Body__
* [link beast.ref.boost__beast__http__is_body_writer `is_body_writer`]
* __Body__
Requirements
要求
These requirements may undergo non-backward compatible
这些要求可能发生不向后兼容的变更
In this table:
在下表中：
* `W` denotes a type meeting the requirements of [*BodyWriter].
* `B` denotes a __Body__ where
W 表示满足 [*BodyWriter] 要求的类型。

B 表示一个 Body 类型，其中
* `a` denotes a value of type `W`.
* `h` denotes a const value of type `header<isRequest, Fields> const&`.
* `v` denotes a possibly const value of type `Body::value_type&`.
* `ec` is a value of type [link beast.ref.boost__beast__error_code `error_code&`].
* `W<T>` is the type `boost::optional<std::pair<T, bool>>`.
* `a` 表示类型为 `W` 的值。
* `h` 表示类型为 `header<isRequest, Fields> const&` 的常量值。
* `v` 表示类型可能为常量的 `Body::value_type&` 值。
* `ec` 表示类型为 [link beast.ref.boost__beast__error_code `error_code&`] 的值。
* `W<T>` 表示类型 `boost::optional<std::pair<T, bool>>`。
Valid expressions
有效表达式
Expression
表达式
Type
类型
Semantics, Pre/Post-conditions
语义、前置条件与后置条件
`W::const_buffers_type`
`W::const_buffers_type`
A type which meets the requirements of __ConstBufferSequence__. This is the type of buffer returned by `W::get`.
该类型满足 ConstBufferSequence 的要求，为 W::get 返回的缓冲区类型。
`W{h,v};`
`W{h,v};`
A [*BodyWriter] provides an [@https://en.wikipedia.org/wiki/Online_algorithm online algorithm] to obtain a sequence of zero or more buffers from a body during serialization. The implementation creates an instance of this type when needed, and calls into it one or more times to retrieve buffers holding body octets. The interface of [*BodyWriter] is intended to obtain buffers for these scenarios:
[*BodyWriter] 提供一种 [@https://en.wikipedia.org/wiki/Online_algorithm 在线算法]，用于在序列化过程中从消息体获取零个或多个缓冲区序列。实现会在需要时创建该类型的实例，并调用一次或多次以检索包含消息体八位字节的缓冲区。[BodyWriter] 的接口设计用于获取以下场景的缓冲区：
Constructible from `h` and `v`. The lifetime of `h` and `v` are guaranteed to end no earlier than after the `W` is destroyed. The writer shall not access the contents of `h` or `v` before the first call to `init`, permitting lazy construction of the message.

The constructor may optionally require that `h` and `v` are `const` references, with these consequences:

* If `W` requires that `h` and `v` are const references, then the corresponding serializer constructors for messages with this body type will will accept a const reference to a message, otherwise:

* If `W` requires that `h` and `v` are non-const references, then the corresponding serializer constructors for messages with this body type will require a non-const reference to a message.
可从 `h` 和 `v` 构造。`h` 和 `v` 的生命周期保证不早于 `W` 销毁前结束。写入器在首次调用 `init` 之前不应访问 `h` 或 `v` 的内容，以支持消息的延迟构造。

构造函数可选择要求 `h` 和 `v` 为 const 引用，其影响如下：

* 若 `W` 要求 `h` 和 `v` 为 const 引用，则对应消息体类型的序列化器构造函数将接受对消息的 const 引用。
* 否则，若 `W` 要求 `h` 和 `v` 为非 const 引用，则对应消息体类型的序列化器构造函数将要求对消息的非 const 引用。
Called one or more times after `init` succeeds. This function returns `boost::none` if all buffers representing the body have been returned in previous calls or if it sets `ec` to indicate an error. Otherwise, if there are buffers remaining the function should return a pair with the first element containing a non-zero length buffer sequence representing the next set of octets in the body, while the second element is a `bool` meaning `true` if there may be additional buffers returned on a subsequent call, or `false` if the buffer returned on this call is the last buffer representing the body. The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if there was one.
`init` 成功后，该函数被调用一次或多次。若之前调用已返回代表该主体的所有缓冲区，或该函数设置 `ec` 用于指示错误，则该函数返回 `boost::none`。若仍存在剩余缓冲区，则该函数应返回一个 pair，其第一元素包含一个长度非零的缓冲区序列，用于表示该主体中下一组八位字节；其第二元素为 `bool` 类型，`true` 用于表示后续调用可能返回更多缓冲区，`false` 用于表示本次调用所返回的缓冲区为该主体最后一部分。该函数确保：若无错误，则 `!ec` 为 `true`；若存在错误，则将 `ec` 设为对应的错误码。
`a.init(ec)`
`a.init(ec)`
`a.get(ec)`
`a.get(ec)`
Exemplar
示例
`W<W::const_buffers_type>`
`W<W::const_buffers_type>`
Models
模型

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User avatar Bstran

Translation changed
Constructible from `h` and `v`. The lifetime of `h` and `v` are guaranteed to end no earlier than after the `W` is destroyed. The writer shall not access the contents of `h` or `v` before the first call to `init`, permitting lazy construction of the message.

The constructor may optionally require that `h` and `v` are `const` references, with these consequences:

* If `W` requires that `h` and `v` are const references, then the corresponding serializer constructors for messages with this body type will will accept a const reference to a message, otherwise:

* If `W` requires that `h` and `v` are non-const references, then the corresponding serializer constructors for messages with this body type will require a non-const reference to a message.
Constructible from可从 `h` and和 `v`. The lifetime of 构造。`h` and和 `v` are guaranteed to end no earlier than after the `W` is destroyed. The writer shall not access the contents of的生命周期保证不早于 `W` 销毁前结束。写入器在首次调用 `init` 之前不应访问 `h` or或 `v` before the first call to `init`, permitting lazy construction of the message.

The constructor may optionally require that的内容，以支持消息的延迟构造。

构造函数可选择要求 `h` and和 `v` are `const` references, with these consequences:为 const 引用，其影响如下：

* If若 `W` requires that要求 `h` and和 `v` are为 const references, then the corresponding serializer constructors for messages with this body type will will accept a const reference to a message, otherwise:

* If `W` requires that引用，则对应消息体类型的序列化器构造函数将接受对消息的 const 引用。
* 否则，若 `W` 要求 `h` and和 `v` are non-const references, then the corresponding serializer constructors for messages with this body type will require a non-const reference to a message.为非 const 引用，则对应消息体类型的序列化器构造函数将要求对消息的非 const 引用。
06/18/2026
User avatar admin

String added in the repository
Constructible from `h` and `v`. The lifetime of `h` and `v` are guaranteed to end no earlier than after the `W` is destroyed. The writer shall not access the contents of `h` or `v` before the first call to `init`, permitting lazy construction of the message.

The constructor may optionally require that `h` and `v` are `const` references, with these consequences:

* If `W` requires that `h` and `v` are const references, then the corresponding serializer constructors for messages with this body type will will accept a const reference to a message, otherwise:

* If `W` requires that `h` and `v` are non-const references, then the corresponding serializer constructors for messages with this body type will require a non-const reference to a message.
Constructible from `h` and `v`. The lifetime of `h` and `v` are guaranteed to end no earlier than after the `W` is destroyed. The writer shall not access the contents of `h` or `v` before the first call to `init`, permitting lazy construction of the message.

The constructor may optionally require that `h` and `v` are `const` references, with these consequences:

* If `W` requires that `h` and `v` are const references, then the corresponding serializer constructors for messages with this body type will will accept a const reference to a message, otherwise:

* If `W` requires that `h` and `v` are non-const references, then the corresponding serializer constructors for messages with this body type will require a non-const reference to a message.
06/05/2026
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English Chinese (Simplified Han script)
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String information

Source string description
type: table cell
Unit identifier
58730
Source string location
string ID 50
String age
06/05/2026
Last updated
06/26/2026
Source string age
06/05/2026
Translation file QuickBook file
doc/qbk/07_concepts/BodyWriter_zh_Hans.qbk, string 18